SSL_set_shutdown, SSL_get_shutdown - manipulate shutdown
state of an SSL connection
void SSL_set_shutdown(SSL *ssl, int mode);
int SSL_get_shutdown(SSL *ssl);
SSL_set_shutdown() sets the shutdown state of ssl to mode.
SSL_get_shutdown() returns the shutdown mode of ssl.
The shutdown state of an ssl connection is a bitmask of:
0 No shutdown setting, yet.
A "close notify" shutdown alert was sent to the peer,
the connection is being considered closed and the session
is closed and correct.
A shutdown alert was received form the peer, either a
normal "close notify" or a fatal error.
SSL_SENT_SHUTDOWN and SSL_RECEIVED_SHUTDOWN can be set at
the same time.
The shutdown state of the connection is used to determine
the state of the ssl session. If the session is still
open, when SSL_clear(3) or SSL_free(3) is called, it is
considered bad and removed according to RFC2246. The
actual condition for a correctly closed session is
SSL_SENT_SHUTDOWN (according to the TLS RFC, it is acceptable
to only send the "close notify" alert but to not wait
for the peer's answer, when the underlying connection is
closed). SSL_set_shutdown() can be used to set this state
without sending a close alert to the peer (see
If a "close notify" was received, SSL_RECEIVED_SHUTDOWN
will be set, for setting SSL_SENT_SHUTDOWN the application
must however still call SSL_shutdown(3) or SSL_set_shut-
SSL_set_shutdown() does not return diagnostic information.
SSL_get_shutdown() returns the current setting.
ssl(3), SSL_shutdown(3), SSL_CTX_set_quiet_shutdown(3),
OpenBSD 3.6 2002-05-14 2 [ Back ]